An invariant regarding Waring's problem for cubic polynomials

Details An invariant regarding Waring's problem for cubic polynomials An invariant regarding Waring's problem for cubic polynomials

2007-12-15

arxiv.org/abs/0712.2527v1

Mathematics

Algebraic Geometry

11 pages

Scientific paper

We compute the equation of the 7-secant variety to the Veronese variety (P^4,O(3)), its degree is 15. This is the last missing invariant in the Alexander-Hirschowitz classification. It gives the condition to express a homogeneous cubic polynomial in 5 variables as the sum of 7 cubes (Waring problem). The interesting side in the construction is that it comes from the determinant of a matrix of order 45 with linear entries, which is a cube. The same technique allows to express the classical Aronhold invariantof plane cubics as a pfaffian.

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